OPS MARINE 11cc-.67 op82711 engine. This is the new drum valve version and is very popular either for competition or sport, this engine is very rugged with lots of power at both ends and comes with slide carburetor with bell crank for easy installation and a double bushed con-rod fro long life.The engine comes with a marine tuned pipe. Displacement = 11cc-.67 Speed range = 6000-23000 Power = 4.35hp Weight = 680gr ABC Piston liner 3+2 ports. All in stock at GotNitro.com!